зеркало из https://github.com/mozilla/gecko-dev.git
57 строки
2.0 KiB
C++
57 строки
2.0 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DOM_MEDIA_MEDIACONTROL_AUDIOFOCUSMANAGER_H_
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#define DOM_MEDIA_MEDIACONTROL_AUDIOFOCUSMANAGER_H_
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#include "base/basictypes.h"
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#include "nsTArray.h"
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#include "VideoUtils.h"
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namespace mozilla {
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namespace dom {
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class IMediaController;
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class MediaControlService;
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/**
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* AudioFocusManager is used to assign the audio focus to different requester
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* and decide which requester can own audio focus when audio competing happens.
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* When the audio competing happens, the last request would be a winner who can
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* still own the audio focus, and all the other requesters would lose the audio
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* focus. Now MediaController is the onlt requester, it would request the audio
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* focus when it becomes audible and revoke the audio focus when the controller
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* is no longer active.
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*/
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class AudioFocusManager {
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public:
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void RequestAudioFocus(IMediaController* aController);
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void RevokeAudioFocus(IMediaController* aController);
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explicit AudioFocusManager() = default;
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~AudioFocusManager();
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uint32_t GetAudioFocusNums() const;
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private:
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friend class MediaControlService;
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// Return true if we manage audio focus by clearing other controllers owning
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// audio focus before assigning audio focus to the new controller.
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bool ClearFocusControllersIfNeeded();
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void CreateTimerForUpdatingTelemetry();
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// This would check if user has managed audio focus by themselves and update
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// the result to telemetry. This method should only be called from timer.
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void UpdateTelemetryDataFromTimer(uint32_t aPrevFocusNum,
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uint64_t aPrevActiveControllerNum);
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nsTArray<RefPtr<IMediaController>> mOwningFocusControllers;
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RefPtr<SimpleTimer> mTelemetryTimer;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // DOM_MEDIA_MEDIACONTROL_AUDIOFOCUSMANAGER_H_
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